Use variable annotations everywhere (#2909)

stdlib/2and3/opcode.pyi

@@ -2,22 +2,22 @@ from typing import List, Dict, Optional, Sequence
 
 import sys
 
-cmp_op = ...  # type: Sequence[str]
-hasconst = ...  # type: List[int]
-hasname = ...  # type: List[int]
-hasjrel = ...  # type: List[int]
-hasjabs = ...  # type: List[int]
-haslocal = ...  # type: List[int]
-hascompare = ...  # type: List[int]
-hasfree = ...  # type: List[int]
-opname = ...  # type: List[str]
+cmp_op: Sequence[str]
+hasconst: List[int]
+hasname: List[int]
+hasjrel: List[int]
+hasjabs: List[int]
+haslocal: List[int]
+hascompare: List[int]
+hasfree: List[int]
+opname: List[str]
 
-opmap = ...  # type: Dict[str, int]
-HAVE_ARGUMENT = ...  # type: int
-EXTENDED_ARG = ...  # type: int
+opmap: Dict[str, int]
+HAVE_ARGUMENT: int
+EXTENDED_ARG: int
 
 if sys.version_info >= (3, 4):
     def stack_effect(opcode: int, oparg: Optional[int] = ...) -> int: ...
 
 if sys.version_info >= (3, 6):
-    hasnargs = ...  # type: List[int]
+    hasnargs: List[int]